Method of making pulleys.



No. 771,696. PATENTED OCT. 4, 1904. A; BERAN. METHOD OF MAKING PULLEYS.

APPLICATION FILED SE PT B, 1903.

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N0 MODEL.

UNITED STATES Patented October 4, 1904.

ALBERT BERAN, OF HIRSCHWANG, AUSTRIA-HUNGARY.

METHOD OF MAKING PULLEYS.

SPECIFICATION forming part of Letters Patent No. 771,696, dated October4, 1904. Application filed September 8, 1903. Serial No. 172,386. (Nomodel.)

siding at Hirschwang, in the Province of Lower Austria, in the Empire ofAustria-Hungary, have invented certain new and useful.

Improvements in Methods of Making Pulleys; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters and figures of reference marked thereon, which form apart of this specification.

My invention has relation to the manufacture of pulleys, and moreespecially to the manufacture of pulley-rims for split pulleys made froma block or slab of suitable material in such manner as to obtain aplurality of concentric rims of successively decreasing diameter.

In the accompanying drawings, Figure 1 is a plan view of a block or slabof material. Fig. 2 is a face view of the pulley-rim of greatestdiameter cut from said block, and Fig. 3 is an elevation of a completedpulley.

In carrying out my invention I take, for instance, a block of material aof uniform thickness and make a cross-cut 1, extending from one edge ofthe block equidistant from two of its corners to the center of saidblock, and I then divide the block into concentric rings 6, a, (Z, and aby circular concentric cuts 2, 3, 4, 5, and 6, starting from andreturning back to the cross-cutl. It is obvious that the waste ofmaterial is here reduced to a minimum, as but a small portion of theblock outside of the pulley-rim 2 and the small central portion of theblock a are wasted. On the other hand, considerable time and labor issaved in making these pulley-rims, as a gang of suitable band-saws canbe used to divide the block a at one operation. By the method describedI obtain a series of pulley-rims of uniform width of face and, ifdesired, of uniform thickness, but of successively-reduced diameters,all split at one point. These rims are then split ona line diametricallyopposite the cut or split 1 for the manufacture of split pulleys. I nextmortisethe rim to receive tenons on the ends of arms of a half-hub or,preferably, cut transverse dovetailed grooves 7 in each half-rim nearits terminal edges 1' pasteboard, glued or otherwise cemented togetherand subjected to the required pressure to form a solid, hard, andhomogeneous block in a well-known manner, the number of sheets or boardsused depending of course upon the width of the face of the pulley-rimsto be cut therefrom. I prefer this material not only because it ispossible to obtain a solid, hard, and homogeneous, yet comparativelylight block, but because of the frictional resistance offered by thismaterial to the driving-belt, preventing the slipping of the belt, andconsequently undue heating, and insuring a more uniform angular movementof the pulley.

Having thus described my invention. what I claim as new therein, anddesire to secure by Letters Patent, is

1. The method of making pulley rims, which consists in making across-cut extending from one edge to the center of a block of materialand dividing the block into pulleyrims by concentric circular cuts fromand back to the aforesaid cross-cut, substantially as set forth.

2. The method of making pulley rims, which consists in making across-cut extending from one edge to the center of a block of material,then dividing the block into pulleyrims by concentric circular cuts fromand back to said cross-cut and dividing the split rims so obtained intohalf-rims on a line with the crosscut, substantially as set forth.

3. The method of making pulley rims,

which consists in making a cross-cut extend- I ing from one edge to thecenter of a block of material, dividing said block into pulley-rims byconcentric circular cuts from and back to said cross-cut, dividing thesplit rims thus obtained into half-rims on a line With the aforesaidcross-cut and forming seats in said halfrims for the spokes of a dividedhub, substantially as set forth.

4. The method of making pulley rims, which consists in making across-cut extending from one edge and equidistant from opposite cornersto the center of a square block of material, dividing said block intopulley-rims by concentric circular cuts from and back to said cross-cut,and dividing the split rims thus obtained into half-rims on a line withthe crosscut, substantially as set forth.

5. The method of making pulley rims, Which consists in forming a squareblock by uniting under pressure a suitable number of pulp-boards, makinga cross-cut from one edge and equidistant from opposite corners to thecenter of said block and dividing the latter into pulley-rims bycircular concentric cuts from and back to the cross-cut, substantiallyas set forth.

6. The method of making pulley rims, which consists in forming a squareblock by uniting under pressure a suitable number of pulp-boards, makinga cross-cut from one edge and equidistant from opposite corners to thecenter of said block, dividing the latter into pulley-rims by circularconcentric cuts from and back to the cross-cut, and dividing the splitrims thus obtained into half-rims on a line with the aforesaidcross-cut, substantially as set forth.

7 The method of making pulley rims, which consists in forming a squareblock by uniting under pressure a suitable number of pulp-boards, makinga cross-cut from one edge and equidistant from opposite corners to thecenter of the block, dividing the block into pulley-rims by circularconcentric cuts from and back to said cross-cut, dividing "the splitrims into half pulley-rims on the line of the cross-cut and formingseats in the inner face of said half-rims for the spokes of a dividedhub, substantially as set forth.

In testimony that I claim the foregoing as my invention l have signed myname in presence of two subscribing Witnesses,

ALBERT BERAN.

Witnesses:

Josur RUBASCH, ALVESTO S. HoeUE.

